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Introduction

When you go on a road-trip vacation, you need two things to make the trip a success-good navigational aids (maps), and an understanding of how to measure distances between two points on a road map (1 inch equals 100 miles). When you are working with Adobe Photoshop, one of the keys to making the journey a success is to understand the navigational and measurement aids available. Photoshop lets you choose a measurement system to fit a specific project. For example, if you're working on images destined for the Web or a monitor, you'll be using pixels as a measurement system.

Conversely, if you're outputting to paper, or possibly a 4-color press, you'll likely choose inches or picas. Selecting between different measurement systems does not impact the quality of the final image; only how you measure distance. Trust me on this one; understanding how to measure distance helps to make the journey an enjoyable experience (I know from experience).


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